Cita APA (7th ed.)

Zeller, B., & Tgahrt, R. (1978). Rudolf Borchardt, Alfred Walter Heymel, Rudolf Alexander Schröder. Kösel-Verl..

Cita Chicago (17th ed.)

Zeller, Bernhard, i Reinhard Tgahrt. Rudolf Borchardt, Alfred Walter Heymel, Rudolf Alexander Schröder. München: Kösel-Verl., 1978.

Cita MLA (8th ed.)

Zeller, Bernhard, i Reinhard Tgahrt. Rudolf Borchardt, Alfred Walter Heymel, Rudolf Alexander Schröder. Kösel-Verl., 1978.